By Daniel Moxon Max Verstappen said he was “still not entirely happy” with his Red Bull car despite winning Saturday’s Sprint race in Florida. The Dutchman started the 19-lap dash on pole and led from start to finish. But it wasn’t an easy drive and Verstappen moaned over the radio about a lack of grip from his rear tyres. Fortunately for the 26-year-old, changes to Parc Fermé rules this year allow set-up changes between the Sprint and qualifying for the main race. And Verstappen is relying on progress during that time to ensure he is more comfortably in his car for the rest of the weekend. Af…